ModuleNotFoundError: No module named'flask

I'm trying to work with a database using flask in a virtual environment of pyenv.

I'm trying to use SQLalchemy and something like postgrew for the database, but I get the error at the beginning all the time. Why am I changing requirements.txt and deploying?

⇨ If you redeploy pip install flask-sqlalchemy to pipenv install flask-sqlalchemy, this error may disappear

I got a new error

that's all.

Postscript: I thought it was an error. What a hell.

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